Syringe



Aug' 7, 1956 R. w. oGLE 2,757,672

SYRINGE Filedmy 7. 1955 IN V EN TOR. R085? 7 w. 004 E United StatesPatent O SYRINGE Robert W. Ogle, Pasadena, Calif. Application May 7,1953, 'serial No. 353,572

a claims. (cl. 128-218).

This invention relates to a syringe and more particularly to a syringehaving a polyethylene plastic body provided with means for removablyreceiving a metallic needle.

Many medicamlents such as procaine penicillin are at present dispensedin plastic syringes of the type shown in'rny copending application,Serial No. 235,807, filed July 9, 1951, now Patent No. 2,693,803 ofNovember 9, 1954, wherein a metallic needle is perrnanently aflixed inthe end of the barrel of the syringe, and the whole mechanism, includingthe needle, is designed to be thrown away after the medicament has beenused. This, of course, results in the loss not only of the plastic bodybut of the needle itself.

It is a primary object of this invention to provide a disposable syringehaving a removable needle so that the needle part of the syringe may beremoved after use, sterilized and reused.

Various attempts have been lmade in an effort to provide a polyethyleneplastic syringe barrel to which there can be attached a removablemetallic needle, and I have now disco-vered that certain relationshipsmust be maintained between the attaching mechanisms in order to providea serviceable mechanism.

These and other objects, features and advantages of the invention willbe apparent from the annexed specification in which:

. Figure 1 is anenlarged side view of a syringe embodying the presentinvention showing the needle attached.

Figure 2 is an enlarged fragmentary section taken along the line 2-2 ofFigure l.

Figure 3 is a section taken along the line 3-3 of Figure 2.

Referring now more particularly to the drawings, there is shown 'asyringe indicated generally by the numeral' having a tubular barrelllprovided with a flange 12. The barrel 11 is provided with acylindrical bore 13 and a post 14 extending therefrom having an axiallyextending bore 15 communicating with the interior of the bore 13.Surrounding the post 14 is a skirt 16 which is en-v larged as 'at 17providing a shoulder 18. The annular skirt 16 surrounds the'post 14substantially throughout its length. A female thread 19 is molded orotherwise formed on the interior of the skirt 16, which thread extends,as shown at 20, into the region of the enlarged i portion 17. a

A conventional Luer lock type needle 21 is adapted to be used with theabove described mechanism, said needle comprising a cannula 22 aflixedto lan attaching member 23, which attaching member 23 is provided with askirt 24 on which there is formed a pair, of tapered extensions 25 and26 adapted to n'de in the threads 19 when the needle is attached to thebody of the syringe as shown p 2,757,67z Patented Aug. 7, 1956 ICCthreads, the extensions 25 and 26 Will lie in the portions i 20 of thethreads 19 in the region of the thickened portion 17 of the skirt 16.

It has been found in practice that in the absence of said thickenedportion 17, an insecure and unsatisfactory mounting of the needle uponthe syringe is obtained but that when the skirt 16 is reinforced, asshown at 17, and the needle is threaded upon the post 14 until theextensions 25 and 26 lie in the region of thelthickened portion 17, thisclfiiculty is overcome. I

The post 14 is preferably of a diameter slightly in excess of theinternal diameter of the bore 27 of the skirt 24, but as the post 14 isformed ofV polyethylene plastic, it is sufficiently resilient to receivethe skirt 24 with a pressiit, thus making a firm and sterile sealthereon.

The open end of the barrel 11 is adapted to receive medicament and anysuitable form of piston or plunger for ejecting the medicament throughthe needle 22.'

While there has been described what is at present considered a preferredembodiment of the present invention, it will be appreciated by thoseskilled in the art that various changes and modifications 'can be madetherein without departing from the essence of the invention and it isintended to cover herein all such changes and modifications as comewithin the true spirit and scope of the appended claims.

I claim:

l. A syringe comprising: a barrel having an open end and a closed end;an axially extending post on said closed end having a bore communicatingwith said barrel; an annular skirt formed on said barrel spaced from butsurroundng said post substantially throughout its length; a femalethread in said skirt; said skirt having an enlarged reinforcing portionadjacent said barrel; and said thread extending into the region 'of saidenlarged portion.

2. A syringe comprising: a barrel having an open end and a closed end;an axially extending post on said closed end having a bore communicatingwith said barrel; an Vannular skirt formed on said barrel spaced frombut Surrounding said post substantially throughout its length; a femalethread in said skirt; said skirt having an enlarged reinforcing portionadjacent said barrel; said thread extending into the region of' saidenlarged portion; and said syringe being composed entirely ofpolyethylene plastic material.

3. A syringe comprising: a barrel having an open end and a closed end;an aXially extending post on said closed end having a bore communicatingwith said barrel; an annular skirt formed on said barrel spaced from butsurrounding said post substantially throughout its length; a femalethread in said skirt; said skirt having an enlarged reinforcing portionadjacent said barrel; said thread extending into the region of saidenlarged portion; said syringe being composed entirely of polyethyleneplastic material; and said post and said skirt being adapted toremovably receivefa metalic needle having an attaching skirt'having apair of male thread-forrning extensions thereon.

References Cited in the file of this patent UNITED STATES PATENTS1,742,497 Dickson Ian. 7, 1930 2,616,420 Hart Nov. 4, 1952 2,677,374Burnside May 4, 1954

